+60HP/+73Tq on the 35i motor for $1,699!

I'm definitely interested, but main concern is how does Dinan's warranty work vs. OEM's? Anyone has experience w/Dinan products w/subsequent OEM warranty denied by BMW? What happens after that point?

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11' X5 35i Sport Activity - AW/Blk/Alum
06' Subaru Legacy GT - GONE
05' BMW X3 3.0 - GONE
01' Honda Prelude, modded - GONE